Servo tuning / debugging help - clarification of context….

Thank you, Todd.
any value of FF1, whether positive or negative, does not affect the f-error curve. I tried values from -10 to +10.

can you post hal and ini files?

looks like an scaling error or some wrong hal linking

db1981 wrote: can you post hal and ini files?

looks like an scaling error or some wrong hal linking

He posted the files in the first post.

Comment out this line in your hal file for each axis.

That and you may want to update to a more current version of Linuxcnc.
That problem is caused by a bug in PNCconf that was corrected in later versions of Linuxcnc 2.7.

now I've 2.7.15 linuxcnc version.
Do you think, upgrade on 2.8 can eliminate this anomaly?
yes I started with PNCconf and then added the necessary functionality.
I 'll try to comment you wrote.tomorow I'll send actual config file.